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MICRF104 Datasheet(PDF) 1 Page - Micrel Semiconductor

Part No. MICRF104
Description  1.8V, QwikRadio™ UHF ASK Transmitter
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF104 Datasheet(HTML) 1 Page - Micrel Semiconductor

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November 8, 2001
1
MICRF104
MICRF104
Micrel
MICRF104
1.8V, QwikRadio™ UHF ASK Transmitter
Final Information
General Description
The MICRF104 is a low voltage Transmitter IC for remote
wireless applications. The device employs Micrel’s latest
QwikRadio™ technology.
This device is a true “data-in,
antenna-out” device. All antenna tuning is accomplished
automatically within the IC which eliminates manual tuning,
and reduces production costs. The result is a highly reliable
yet extremely low cost solution for high volume wireless
applications. The MICRF104 incorporates a DC/DC con-
verter to boost the input voltage up to 5V for the RF portion of
the IC. This feature enables the MICRF104 to operate off
supply voltages as low as 1.8V and transmit at power in
excess of –2dBm.
The MICRF104 uses a novel architecture where the external
loop antenna is tuned to the internal UHF synthesizer. This
transmitter is designed to comply worldwide UHF unlicensed
band intentional radiator regulations. The IC is compatible
with virtually all ASK/OOK (Amplitude Shift Keying/On-Off
Keyed) UHF receiver types from wide-band super-regenera-
tive radios to narrow-band, high performance super-hetero-
dyne receivers. The transmitter is designed to work with
transmitter data rates from 100 to 20k bits per second.
The automatic tuning in conjunction with the external resistor,
insures that the transmitter output power stays constant for
the life of the battery.
When coupled with Micrel’s family of QwikRadio™ receivers,
the MICRF104 provides the lowest cost and most reliable
remote actuator and RF link system available.
Typical Application
VDDPWR
VSS
REFOSC
VSS
5V
EN
MICRF104
DATA IN
0.1
µF 100pF 10µF
10
µF
L1
22
µH
8
9
10
11
12
13
14
1
2
3
4
5
6
7
VSS
SW
PC
RFSTBY
VDDRF
ASK
ANTM
ANTP
Power
Control
RF Standby
1.8V to 4V
Supply
LOOP
ANTENNA
(PCB TRACE)
Figure 1
Features
• Complete UHF transmitter on a chip
• Frequency range 300MHz to 470MHz
• Data rates to 20kbps
• Automatic antenna alignment, no manual adjustment
• Low external part count
Applications
• Remote Keyless Entry Systems (RKE)
• Remote Fan/Light Control
• Garage Door Opener Transmitters
• Remote Sensor Data Links
Ordering Information
Part Number
Temperature Range
Package
MICRF104BM
0
°C to +85°C
14-Pin SOIC
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of orlando, Florida


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